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This CL makes sure that when sharing is initiated from the
sharesheet action, the feature is silently enabled and the user
is taken to the discovery page if they've already completed
the onboarding flow once.

Fixed this by exposing the onBoardingCompletePref value in
nearby share settings mojo interface and checking this value
in the send flow.

Fixed: 1157142
Change-Id: Ie65aa9ce22d8e8a38ce06e299b446865837ca60d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2586099Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Josh Nohle <nohle@chromium.org>
Commit-Queue: Azeem Arshad <azeemarshad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836898}